Columbus Superconductors

Genova, Italy

Columbus Superconductors

Genova, Italy
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News Article | July 26, 2017
Site: www.eurekalert.org

A huge market volume in offshore wind turbines is expected over the next few years, but a significant cost reduction is needed to achieve this. The market is calling for more powerful and more reliable wind turbines capable of cutting the investment and operating costs of offshore wind farms. Yet the turbines in the 10-MW range based on conventional generators are of such a size and weight that they cast doubt not only on their technical but also economic viability. This new generator has a 26% weight reduction over a permanent magnet generator, which boils down to a cut of up to 1 million euros in the cost of a 10-MW wind turbine. TECNALIA has patented the concept on which this generator is based in Europe and in the United States. European companies of proven prestige, leading players in the offshore wind energy sector such as GAMESA, Siemens, GE or INGETEAM, have expressed a high degree of interest in this development. The superconducting coils and the cooling system needed to produce the low temperatures required (-253 ºC) have posed the main challenges in developing these generators. To validate the concept, a smaller prototype has been built but whose more innovative components are the same size and operate in conditions similar to those of the 10-MW generator. This generator has been produced within the framework of the SUPRAPOWER project (SUPerconducting, Reliable, lightweight, And more POWERful offshore wind turbine). The consortium involved in this development includes Columbus Superconductors, Solute Ingenieros, Ingeteam, D2M Engineering, the Karlsruher Institut für Technologie, the IEE- Slovak Academy of Science, and the University of Southampton.


News Article | June 21, 2017
Site: www.prnewswire.com

LONDON, June 21, 2017 /PRNewswire/ -- This report analyzes the worldwide markets for Superconducting Magnetic Energy Storage (SMES) Systems in US$ Thousand. The report provides separate comprehensive analytics for the US, Canada, Japan, Europe, Asia-Pacific, and Rest of World. Annual estimates and forecasts are provided for the period 2016 through 2024. Also, a five-year historic analysis is provided for these markets. Market data and analytics are derived from primary and secondary research. Company profiles are primarily based on public domain information including company URLs. The report profiles 22 companies including many key and niche players such as - Download the full report: https://www.reportbuyer.com/product/1861849/ ABB, Inc. American Superconductor Corporation ASG Superconductors SpA Babcock Noell GmbH Bruker Energy & Supercon Technologies Download the full report: https://www.reportbuyer.com/product/1861849/ I. INTRODUCTION, METHODOLOGY & PRODUCT DEFINITIONS Study Reliability and Reporting Limitations Disclaimers Data Interpretation & Reporting Level Quantitative Techniques & Analytics Product Definition and Scope of Study II. EXECUTIVE SUMMARY 1. INDUSTRY OVERVIEW Why Energy Storage? SMES: A Promising Energy Storage Technology Asia-Pacific Spearheads Growth in the Global SMES Systems Market How Significant is SMES for Power Utilities? Effect of Energy Storage System Integration in Power Grid at Different Levels Focus on Green Energy Storage Bodes Well for SMES Systems Development of Superconducting Materials: Essential for Market's Progress R&D Efforts Focused on Addressing Cost Issues & Storage Capacity in SMES Systems Rapid Charging & Discharging and Minimal Energy Losses: Major Advantages Growing Need to Develop SMES Systems with Larger Power Storage Capacities Growing Deployment of Smart Grids - An Opportunity for SMES Systems Market High Cost: A Major Obstacle to Adoption in Large-Scale Applications Challenges Faced in Deployment of SMES Systems Competitive Landscape 2. MARKET TRENDS & ISSUES Focus on Sustainable Power Sourcing Enhances Significance of Energy Storage Table 1: Targets for Electricity Production from Renewable Energy Sources in Select Countries Table 2: Top Producers of Electricity from Renewable Sources - Percentage of Electricity Production from Renewable Energy Sources by Country (includes corresponding Graph/Chart) Why Energy Storage Can Be a Game Changer for Renewable Energy? Focus on Energy Efficiency to Drive Prospects for Energy Storage Rising Renewable Energy Consumption to Drive Energy Storage Market Table 3: World Cumulative Installed Capacity of Wind Power in GW for the Years 2016, 2018 & 2020 (includes corresponding Graph/Chart) Table 4: World Cumulative Installed Capacity of Solar Power in GW for the Years 2010, 2012, 2014 & 2026 (includes corresponding Graph/Chart) Assessing the Significance of Storage Technologies in Distributed Generation The Business Case for Installing Energy Storage Systems in DERs Microgrids - Driving Energy Storage in the Future Table 5: A Glance at Largest Power Blackouts/Outages Worldwide New Projects & Government Mandates to Stimulate Energy Storage Market Table 6: Energy Storage Projects Worldwide - Breakdown of Total Number and Rated Power of Projects (MW) by Technology Type (includes corresponding Graph/Chart) Table 7: Energy Storage Projects in Select Countries - Breakdown by Number and Rated Power of Projects (MW) (includes corresponding Graph/Chart) Incentives & Standards: Key to Promoting Energy Storage Technologies 3. ENERGY STORAGE SYSTEMS - AN OVERVIEW Power Grid: From Generation to Distribution World Electricity Generation & Demand: A Review Table 8: Worldwide Net Electricity Generation: Breakdown by Fuel Source in Trillion kWh and %Share for the Years 2012, 2020, 2030 & 2040 (includes corresponding Graph/Chart) Table 9: Top Electricity Consumers Worldwide - Ranked by Electricity Consumed in TWh for the Year 2015 (includes corresponding Graph/Chart) Table 10: Leading Power Consuming Countries Worldwide: Ranked by Per Capita Electricity Consumption in kWh (includes corresponding Graph/Chart) Introduction to Grid Energy Storage Table 11: Grid-Connected Energy Storage Worldwide - Percentage Breakdown of Installed Capacity by Energy Storage Technology for 2016 (includes corresponding Graph/Chart) Types of Energy Storage Systems A Comparative Review of Energy Storage Devices Characteristics of Energy Storage Technologies Applications of Various Energy Storage Technologies Super Capacitor Energy Storage (SCES) Compressed Air Energy Storage System (CAES) Flywheel Energy Storage System (FESS) Pumped Hydro Energy Storage Systems (PHESS) Battery Energy Storage Systems (BESS) Major Functions of Energy Storage Technologies 4. PRODUCT OVERVIEW Superconducting Magnetic Energy Storage (SMES) System: An Introduction Components of SMES System Block Diagram of SMES System Representation of a Superconducting Magnetic Energy Storage (SMES) System Superconducting Coil High-Temperature Vs Low-Temperature Superconductors Why HTSC System Costs More? Cryogenic Refrigerator Power Conversion System Control System Operation of SMES Performance Capabilities of SMES Solenoid Vs Toroid A Glance at Major Applications of SMES Systems Power System Applications of SMES Technology Cost Components of SMES System Advantages of SMES Vs Other Systems for Energy Storage System Stability Power Quality Load leveling Drawbacks of SMES Economic Viability of SMES Systems Current Efforts in SMES Space U.S. Department of Energy (DOE)'s ARPA-E Program Use of SMES Technology in Defense & Space Applications 5. RECENT INDUSTRY ACTIVITY Rolls Royce Develops SMES Device BEST Acquires Oxford Instruments Superconducting Wire SuperPower Establishes Testing Systems for 2G High Temperature Supeconductors Superconductor Technologies Develops Conductus® Superconducting Wire SuperPower Unveils Range of HTS Products Bruker Launches Ascend™ Aeon 600 MHz and Ascend™ Aeon 700 MHz Superconducting Magnet Systems SuperPower in Collaboration with Program Partners Make Headway in SMES Projects Fujikura Develops Largest Yttrium-based 5T HTS Magnet 6. FOCUS ON SELECT PLAYERS ABB, Inc. (USA) American Superconductor Corporation (USA) ASG Superconductors SpA (Italy) Columbus Superconductors SpA (Italy) Babcock Noell GmbH (Germany) Beijing Innopower Superconductor Cable Co., Ltd (China) Bruker Energy & Supercon Technologies (USA) Fujikura Ltd. (Japan) Hyper Tech Research, Inc. (USA) Luvata U.K. Ltd (UK) Nexans SA (France) Southwire Company, LLC (USA) Sumitomo Electric Industries, Ltd (Japan) Superconductor Technologies, Inc. (USA) SuperPower, Inc. (USA) SuNam Co., Ltd. (South Korea) 7. GLOBAL MARKET PERSPECTIVE Table 12: World Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - US, Canada, Japan, Europe, Asia-Pacific (excluding Japan) and Rest of World Markets Independently Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 13: World Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - US, Canada, Japan, Europe, Asia-Pacific (excluding Japan) and Rest of World Markets Independently Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) Table 14: World 14-Year Perspective for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - Percentage Breakdown of Dollar Sales for US, Canada, Japan, Europe, Asia-Pacific (excluding Japan) and Rest of World Markets for Years 2011, 2017 & 2024 (includes corresponding Graph/Chart) III. MARKET 1. THE UNITED STATES A.Market Analysis Outlook Power Grid Woes Turn Focus onto Storage Technologies Limitations of Power Grid Necessitate Use of Energy Storage Devices Table 15: Energy Storage Projects in the US (2016): Percentage Breakdown of Number of Projects and Rate Power by Type of Technology (includes corresponding Graph/Chart) Rising Number of Energy Storage Projects - Opportunity for SMES Systems Legislations Encourage Energy Storage Market Increasing Investments in Energy Storage Solutions Strategic Corporate Developments Key Players B.Market Analytics Table 16: US Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 17: US Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 2. CANADA Market Analysis Table 18: Canadian Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 19: Canadian Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 3. JAPAN A.Market Analysis Outlook Strategic Corporate Development Key Players B.Market Analytics Table 20: Japanese Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 21: Japanese Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 4. EUROPE A.Market Analysis Market Overview Energy Storage in the EU Energy Associations Draw Up Roadmap for Developing Energy Storage Technologies B.Market Analytics Table 22: European Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - France, Germany, Italy, UK and Rest of Europe Markets Independently Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 23: European Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - France, Germany, Italy, UK and Rest of Europe Markets Independently Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) Table 24: European 14-Year Perspective for Superconducting Magnetic Energy Storage (SMES) Systems by Geographic Region - Percentage Breakdown of Dollar Sales for France, Germany, Italy, UK and Rest of Europe Markets for Years 2011, 2017 & 2024 (includes corresponding Graph/Chart) 4a. FRANCE A.Market Analysis Outlook Nexans SA - A Major Player B.Market Analytics Table 25: French Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 26: French Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 4b. GERMANY A.Market Analysis Outlook Table 27: Power Generation Mix in Germany (2016): Percentage Breakdown of Power Production by Energy Source (includes corresponding Graph/Chart) Strategic Corporate Development Babcock Noell GmbH - A Key Player B.Market Analytics Table 28: German Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 29: German Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 4c. ITALY A.Market Analysis Outlook Key Players B.Market Analytics Table 30: Italian Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 31: Italian Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 4d. THE UNITED KINGDOM A.Market Analysis Outlook Strategic Corporate Development Luvata U.K. Ltd - A Key Player B.Market Analytics Table 32: UK Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 33: UK Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 4e. REST OF EUROPE Market Analysis Table 34: Rest of Europe Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 35: Rest of Europe Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 5. ASIA-PACIFIC A.Market Analysis Outlook Asia: Active Proponent of Energy Storage Technologies Table 36: Asian Market for Energy Storage Systems by Technology (2016E): Percentage Share Breakdown of Value Sales for Advanced Batteries, Pumped Hydro, and Others (includes corresponding Graph/Chart) Growth Drivers of Energy Storage Technologies in Asia China: Government Support Driving Growth in the Field of Superconductivity South Korea Korea Looks to Renewables to Meet Rising Power Demands Government Promotes Energy Storage Technologies Key Players B.Market Analytics Table 37: Asia-Pacific Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 38: Asia-Pacific Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) 6. REST OF WORLD Market Analysis Table 39: Rest of World Recent Past, Current & Future Analysis for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2016 through 2024 (includes corresponding Graph/Chart) Table 40: Rest of World Historic Review for Superconducting Magnetic Energy Storage (SMES) Systems Market Analyzed with Annual Sales Figures in US$ Thousand for Years 2011 through 2015 (includes corresponding Graph/Chart) IV. COMPETITIVE LANDSCAPE Total Companies Profiled: 22 (including Divisions/Subsidiaries - 26) The United States (10) Japan (6) Europe (7) - France (2) - Germany (1) - The United Kingdom (1) - Italy (2) - Rest of Europe (1) Asia-Pacific (Excluding Japan) (3) Download the full report: https://www.reportbuyer.com/product/1861849/ About Reportbuyer Reportbuyer is a leading industry intelligence solution that provides all market research reports from top publishers http://www.reportbuyer.com For more information: Sarah Smith Research Advisor at Reportbuyer.com Email: query@reportbuyer.com Tel: +44 208 816 85 48 Website: www.reportbuyer.com To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/global-superconducting-magnetic-energy-storage-smes-systems-industry-300477661.html


Vignolo M.,CNR Institute of Neuroscience | Bovone G.,University of Genoa | Matera D.,CNR Institute of Neuroscience | Nardelli D.,Columbus Superconductors | And 3 more authors.
Chemical Engineering Journal | Year: 2014

In the present paper a new process for large scale production of nano-sized boron is reported. The process can be summarized in several steps: boron oxide solubilization in hot water, cryogenic freezing of liquid phase, freezing-drying process, magnesiothermic reduction of boron oxide, boron purification. Each step is described in order to show the innovations and then the purified boron has been employed to synthesize the superconducting MgB2 powder. It is worth to note that for the first time the same MgB2 precursors were used to prepare the superconducting phase following four different techniques and the results directly compared. So several MgB2 conductors were prepared applying different techniques, ex-situ, in-situ, via MgB4 and RLI, and then their superconducting properties investigated. Furthermore morphology, grain size and purity of B and MgB2 powder were analyzed by SEM analysis and X-ray diffraction technique. © 2014 Elsevier B.V.


Pitel J.,Slovak Academy of Sciences | Melisek T.,Slovak Academy of Sciences | Tropeano M.,Columbus Superconductors | Nardelli D.,Columbus Superconductors | Tumino A.,Columbus Superconductors
Physica C: Superconductivity and its Applications | Year: 2016

In this work, we present a mathematical model which enables to design cylindrical coils with a given central field, made of the superconducting conductor with isotropic Ic(B) characteristic. The model results in a computer code that enables to find out the coil dimensions, and to calculate the coil parameters such as critical current, maximum field in the winding and field non-uniformity on the coil axis. The Ic(B) characteristic of the conductor is represented by the set of data measured in discrete points. This approach allows us to express the Ic(B) as a function linearized in parts. Then, it is possible to involve the central field of the coil, coil dimensions, and parameters of the conductor, including its Ic(B) characteristic, in one equation which can be solved using ordinary numerical non-linear methods. Since the coil dimensions and conductor parameters are mutually linked in one equation with respect to a given coil central field, it is possible to analyze an influence of one parameter on the other one. The model was applied to three commercially available MgB2/Ni/Cu conductors produced by Columbus Superconductors. The results of simulations with the Ic(B) data at 20 K illustrate that there exists a set of winding geometries that generate a required central field, changing from a disc shape to long thin solenoid. Further, we analyze how the thickness of stabilizing copper influences the coil dimensions, overall conductor length, coil critical current, maximum field in the winding. An influence of the safety coefficient in operating current on coil dimensions and other above mentioned parameters is studied as well. Finally, we compare the coil dimensions, overall conductor length as well as coil critical current and maximum field in the winding if the value of required central field changes between 1 and 3 T. © 2016 Elsevier B.V. All rights reserved.


Pitel J.,Slovak Academy of Sciences | Kovac P.,Slovak Academy of Sciences | Tropeano M.,Columbus Superconductors | Grasso G.,Columbus Superconductors
Superconductor Science and Technology | Year: 2015

Abstract The goal of this theoretical study is to illustrate the potential of three different MgB2 tapes, developed by Columbus Superconductors, for application in cylindrical coils. First, the distribution of critical currents and electric fields of individual turns is compared when the winding of the model coil is made with tapes having different Ic(B) and anisotropy values. Second, the influence of the winding geometry on basic parameters of cylindrical coils which consist of a set of pancake coils, such as critical current Icmin, central magnetic field B0 and stored energy E, is analysed. The winding geometry of the coils, i.e. the outer winding radius and the coil length, with the same inner winding radius, was changed from a disc shape to a long thin solenoid in such a way that the overall tape length was held constant, and considered as a parameter. Finally, the winding cross-section of the coil is optimized with respect to the constant tape length in order to reach the maximum central field. The results of calculations show that for a given overall tape length and inner winding radius there exists only one winding geometry which generates the maximum central field. The overall tape length, as a parameter, is changed in a broad range from 500 m to 10 km. All calculations were performed using the experimental data measured at 20 K while the effect of the anisotropy in the Ic(B) characteristic of the short samples is taken into account. © 2015 IOP Publishing Ltd.


Mine S.,General Electric | Xu M.,General Electric | Buresh S.,General Electric | Stautner W.,General Electric | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

The authors have reported the results of low n -value from a MgB 2 test coil developed a year ago. A second test coil has been developed with wire of different structure and manufacturing process. Although the n-value related voltage of the second test coil was lower than the first test coil at designed current, it still showed low n-value. A third test coil has been wound with reduced mechanical stress. It also showed very similar n-value related voltage and n-value. Investigation of voltage distribution over the coil indicated that magnetic field was the major factor causing degradation of the n-value and resulting in n -value related voltages. Since the n-value related coil voltages were on the order of 0.1 \mu\hbox{V/cm}, the usual short sample I\rm c test (1 \mu\hbox{V/cm} was the definition of I \rm c ) might not detect the n-value related voltage and might not be able to investigate the cause of low n -value. Therefore, the medium length (\sim10 m) samples were tested and they showed the wire's lengthwise nonuniformity both on n -value and I\rm c, which might be another potential cause of the low n-value of the coil. Along with the electrical investigation, the manufacturing process of the wire was carefully inspected for longitudinal uniformity. Some wire segment samples from the same batch exhibited nonuniformity in the particle size distribution resulting in nonuniform filaments. This might have occurred in the wire for the second and third test coils. © 2002-2011 IEEE.


Nardelli D.,Columbus Superconductors | Matera D.,University of Genoa | Vignolo M.,CNR Institute of Neuroscience | Bovone G.,University of Genoa | And 5 more authors.
Superconductor Science and Technology | Year: 2013

A high-purity MgB4 phase has been synthesized and used as the precursor powder for the realization of in situ wires. Various final heat treatments, from 550 to 1100 ° C for 20 min each, have been carried out to convert the inner mixture to MgB2. Critical current densities up to 1.75 × 106 and 0.98 × 106 A cm-2 at 4.2 and 20 K, with 0.2 T, up to 0.76 × 105 A cm-2 at 4.2 K and 4 T, and up to 0.78 × 105 A cm-2 at 20 K and 2 T were measured. Critical temperatures up to 38.5 K were measured. These results suggest that this could be a good alternative to both ex situ and classical in situ routes. © 2013 IOP Publishing Ltd.


Kulich M.,University of Geneva | Flukiger R.L.,University of Geneva | Senatore C.,University of Geneva | Tropeano M.,Columbus Superconductors | Piccardo R.,Columbus Superconductors
Superconductor Science and Technology | Year: 2013

A substantially different behaviour was observed between MgB2 wires produced either by in situ or ex situ processing after applying the recently developed technique of cold high pressure densification (or CHPD). In contrast to in situ wires, where densification at 1.5 GPa on binary and ternary alloyed in situ MgB2 wires causes an enhancement of mass density and a strong enhancement of Jc, ex situ wires up to 2 GPa show only a negligible enhancement of the MgB2 mass density, while a considerable enhancement of Jc is still observed. In both cases, this reflects an enhancement of grain connectivity, however in ex situ wires, the enhancement of Jc is connected to the partial disruption of the oxide layer around each MgB2 powder particle, in contrast to the enhancement of J c in situ wires, which is correlated to a smaller void fraction and a larger contact area between neighbouring grains. It is well known that J c of ex situ wires decreases after longer exposition times when exposed to air prior to annealing; after several months Jc falls to values ≤50% of the original value. After cold pressing, we have found that Jc of the same wire exceeded the original values, even after exposing the unreacted wire for >1 year to air. A lower electrical resistivity is measured on pressed ex situ MgB2 wires, which confirms the improvement of grain connectivity due to the breakage of the oxide layers. Thus, the application of high pressure at room temperature allows us to recover the values of Jc for ex situ wires even after they have been degraded either by low quality MgB2 precursors or by prolonged ageing of the already formed wire prior to the final heat treatment. The limits of the J c enhancement in ex situ wires are discussed. © 2013 IOP Publishing Ltd.


Morandi A.,University of Bologna | Brisigotti S.,Columbus Superconductors | Grasso G.,Columbus Superconductors | Marabotto R.,ASG Superconductors
IEEE Transactions on Applied Superconductivity | Year: 2013

The feasibility of a conduction-cooled MgB2 -based superconducting fault-current limiter with fast recovery is investigated. A real-scale device for a distribution network is considered. The dc resistive configuration is chosen in order to avoid ac losses and to allow conduction cooling. A high-heat-capacity cable is specifically developed in order to cope with the requirement of fast recovery. A short-length sample of the cable is manufactured in order to assess its feasibility. The detailed design of a prototype is also carried out, and the performance is numerically investigated. © 2002-2011 IEEE.


Pelegrin J.,University of Zaragoza | Romano G.,CNR Institute of Neuroscience | Martinez E.,University of Zaragoza | Angurel L.A.,University of Zaragoza | And 5 more authors.
Superconductor Science and Technology | Year: 2013

In the design and feasibility of electric power applications with MgB 2 conductors, thermal conductivity plays an important role. In composite wires and tapes it is mainly determined by the amount of stabilizer (usually copper), while for coils the electric insulation and epoxy binder characteristics are added. In this paper we present results on quench development and propagation on isolated superconducting tapes and small single pancake coils cooled by thermal conduction, for three types of MgB2 tape with different stabilizations. The quench parameters at different temperatures, such as minimum quench energy (MQE), minimum propagation zone (MPZ) and quench propagation velocity (vp), are reported. A complete electrical and thermal characterization of the superconducting tapes and of non-superconducting materials used in the coil manufacture has been made. With these data, numerical computational models using finite element simulations have been performed for isolated wires and single pancake coils, and the results of the relevant quench parameters have been compared with the measured values. © 2013 IOP Publishing Ltd.

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